
body #quit,body #change{position: absolute; background: black; width:100%; height: 100%; opacity: 0.9;top: 0;left: 0; display: none}
h2{ width: 400px; text-align: center;color:white}
span{ display:inline-block; width: 100px;text-align: center; color: white;  }
input{ width: 250px; height: 30px; line-height: 30px; margin-top: 30px;font-family: "微软雅黑";font-size: 16px; line-height: 16px; }
.user,.manager{ height: 15px; line-height: 30px; margin: 30px 10px 30px 30px; width: 30px;}
.manager{ margin-left: 120px;}
.btn{width: 120px; background: #0099ff; border: none; margin-left: 30px; font-size: 16px; height: 35px; color: white; border-radius: 5px }

.btn:hover{ opacity: 0.8; }
#addbook,#changebook{position: absolute;left: 35%;  top:25%; }
#toaddbook,#tochangebook{margin-left:80px; }

